Added waitImmediate to deep scrape, reduced concurrency.

src/utils/jsdom-perf.js

@@ -1,9 +1,12 @@
 'use strict';
 
+const util = require('util');
 const fs = require('fs').promises;
 const Promise = require('bluebird');
 const { JSDOM } = require('jsdom');
 
+const waitImmediate = util.promisify(setImmediate);
+
 async function init() {
 	let peak = 0;
 	const files = await fs.readdir('./html');
@@ -19,9 +22,9 @@ async function init() {
 
 		console.log(`Memory usage: ${usage.toFixed(2)} MB, peak ${peak.toFixed(2)} MB`);
 
-		await Promise.delay(100);
+		await waitImmediate;
 	}, {
-		concurrency: 10,
+		concurrency: 100,
 	});
 
 	await Promise.delay(2000);